package demo3;

public class Computer {
    public  void openComputer(){
        System.out.println("打开电脑");
    }

    public  void closeComputer(){
        System.out.println("关闭电脑");
    }
     public void usbDevice(IUSB iusb){
        iusb.openDevice();
        if(iusb instanceof KeyBoard)
        {
            KeyBoard keyBoard = (KeyBoard) iusb;
            keyBoard.click();
        }else if (iusb instanceof Mouse){
            Mouse mouse = (Mouse) iusb;
            mouse.click();
        }
     }

}
